1.White corundum FEPA P grit 2. for making sanding cloth, sanding paper, abrasive jumbo ... Chemical Analysis:Al2O3 99.45%Na2O 0.26%SiO2 0.13%Fe2O3 0.04%Physical Properties:Color WhiteShape Angular edge sharpCrystal ... .95Hardness 2150 Knoop scaleMagnetic Material 0.0025%Macrogrit Sizes Available (P):12, 16, 20, 24, 30, 36, 40, 50, 60, ... aluminium oxide,fused alumina white fused aluminum oxide FEPA P grit